Question 1268Navigation General

The correct answer is D) All of the above. A front is a boundary between two air masses with different characteristics, such as temperature, humidity, and pressure. The pressure tendencies are different on opposite sides of a front, as the air masses have different pressure patterns. Additionally, there are abrupt temperature differences on opposite sides of a front, as the air masses have distinct temperature properties. Therefore, all the statements in the answer choices are true about a front. The other options are incorrect because they only describe a partial aspect of a front, while a front is characterized by all the features mentioned in the correct answer.